如图,
为⊙O的直径,C为半圆上一动点,过点C作⊙O的切线l,过点B作
,垂足为D,
与⊙O交于点E,连接
,
,
,
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/1/3284c0a5-2693-4ccb-b836-af4c404a74ea.png?resizew=167)
(1)求证:
;
(2)若
,连接
.
①当
= 时,四边形
为菱形;
②当
= 时,四边形
为正方形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0a2d7d40a6c0bf1fddb802db381689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/1/3284c0a5-2693-4ccb-b836-af4c404a74ea.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71185db0d0f1ac3b83b3b442fe93dd59.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e89d43151016343d2ab6c4851565e7.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94c5119a5d7197604b58e8025ca5ae9.png)
2019·河南南阳·二模 查看更多[15]
河南省南召县2019年九年级春期第二次模拟考试数学试题(已下线)专题08 圆中证明及计算问题-决胜2020年中考数学压轴题全揭秘精品(河南)2020年河南省驻马店市中考九年级质量监测数学试题(已下线)【万唯原创】2016年份河南省中考数学黑白卷-普通高中招生考试试卷黑卷(已下线)【万唯原创】2018年河南省中考数学试题研究-河南试卷-河南重难题型研究解答题重难点突破题型3(已下线)【万唯原创】2018年河南省中考数学面对面正文第二部分专题4+5(已下线)【万唯原创】特殊四边形的动态探究·基础专练(已下线)【万唯原创】2018年河南省中考数学试题研究小专项-题型正文-题型3(已下线)【万唯原创】2017年河南省中考数学试题研究专项-数学题型专项训练题型1+2(已下线)【万唯原创】2017年河南省中考数学逆袭卷-逆袭成果检测卷2(已下线)【万唯原创】2018年河南省中考数学面对面正文第二部分专题52021年河南省南阳市镇平县九年级下学期调研测试数学试题(一模)(已下线)数学-(河南卷)【试题猜想】2021年中考考前最后一卷2023年河南省新乡市卫滨区第四十五中学等4校中考一模数学试题2023学年河南省南阳市桐柏县四校联考中考一模数学试题
更新时间:2023-03-30 12:53:01
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】已知:如图,
,
、
是
上两点,且
,作
,
,分别与
、
的延长线交于点
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7852eb99a283b8f0bd5a4dff3c2def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/521151b9b837fbe6908bee01dbd414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619a0dd4307b5f154810a0b72da7a83e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ff8c8d239cc12ddc3a899e9f054aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b49022a6f55817b5d7e3ab443b5491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5f5aad112be331bab0672909ee6c4cf.png)
![](https://img.xkw.com/dksih/QBM/2018/11/1/2066442099892224/2067155299409920/STEM/1b18ad750edd45538425fa5127e1ef15.png?resizew=137)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】有一块等腰三角形木板,其中
(如图),王师傅准备把它分成全等的两部分,
小明和小刚分别设计了两种方案:
(1)小明:确定BC的中点D,连结
(如图1).
(2)小刚:作
于D(如图2).
王师傅说两种办法都行,请选择一种说出其中的道理(写出已知、求证、证明).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
小明和小刚分别设计了两种方案:
(1)小明:确定BC的中点D,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)小刚:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
王师傅说两种办法都行,请选择一种说出其中的道理(写出已知、求证、证明).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/24/ee9ee535-7b50-44be-9c12-27c50af74d22.png?resizew=229)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】已知,在直角坐标系中,
轴于B,P为y轴正半轴上一点,连接
,Q为第四象限内一点,且
,连接
交x轴于C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/c183422b-b1ae-490c-a826-a62fde8800ce.png?resizew=314)
(1)如图1,当
时,求Q点的坐标;
(2)如图2,当
时,求:
的值(用含有n的式子表示);
(3)当
______
时,
.(不用证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/237cee2daabde9573fdcf98b6d4e9e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea661458006142a4e133b5194e80115.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/c183422b-b1ae-490c-a826-a62fde8800ce.png?resizew=314)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09c0a43d3986f9deba76a788539313cf.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5459df51e6117786c0d1bccd24a61c1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e107228b73f719ecb9c17e88d8f574.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a836d2dfc31d2bfc949bac8403cf2a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3163b04ed660ab30c188c0b0eb1819fa.png)
您最近一年使用:0次
解答题-应用题
|
适中
(0.65)
【推荐2】如图,一艘渔船以20海里/时的速度沿正北方向航行,在A处测得灯塔C在渔船北偏东
方向上距A 52海里处,航行1小时后到达点B,在B处测得灯塔D在渔船北偏东
方向上.已知灯塔D在灯塔C的正北方向上,求灯塔C和灯塔D之间的距离.(结果精确到1海里,参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8141d00b74eb4c50bf861e6ff0edf137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2a7c9856c136c465eede5d380db5b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/944835bd-4725-4d8f-b073-e0be90994378.jpg?resizew=193)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
真题
【推荐1】如图,在菱形
中,
,
是对角线
上的两点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/d3c605e3-9fa3-498f-ae8f-a91b08051cb1.png?resizew=233)
(1)求证:
≌
;
(2)证明四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/d3c605e3-9fa3-498f-ae8f-a91b08051cb1.png?resizew=233)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
(2)证明四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,四边形ABCD中,AB=CD,点E、F、G、H分别是BC、AD、BD、AC的中点,猜想四边形EHFG的形状并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/16/d02b222d-95c9-452f-96ee-4d97d3675966.png?resizew=176)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】从⊙O外一点A引⊙O的切线AB,切点为B,连接AO并延长交⊙O于点C,点D,连接BC.
(1)如图1,若∠A=26°,求∠C的度数;
(2)如图2,若AE平分∠BAC,交BC于点E,求∠AEB的度数.
(1)如图1,若∠A=26°,求∠C的度数;
(2)如图2,若AE平分∠BAC,交BC于点E,求∠AEB的度数.
![](https://img.xkw.com/dksih/QBM/2017/4/7/1660451450265600/1661854805000192/STEM/fc88b90829b14471a10569dc03a30146.png?resizew=441)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,在矩形
中,
,
,点A在直线l上,
与直线l相交所得的锐角为
.点F在直线l上,
,
直线l,垂足为点F且
,以
为直径,在
的左侧作半圆O,点M是半圆O上任一点.
发现:
的最小值为 ,
的最大值为 ,
与直线l的位置关系是 .
思考:矩形
保持不动,半圆O沿直线l向左平移,当点E落在
边上时,求半圆与矩形重合部分的周长和面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21fe7f306533f388843ff62fa2b5251a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a028fd5b281ef168702a803baca6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
发现:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
思考:矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次